LEOA algorithm is conducted by C# on a PC with Intel (R) Core i5-4460 3.20 GHz and 4GB real memory. In the folder of LEOA_Algorithm, we realize the LEOA algorithm and the proposed evaluation function Q(C). We apply LEOA algorithm to the dataset Karate and obtain 3 anti-communities(Anti-community 1: 1��3��4��17��25��30��31��34; Anti-community 2: 2��5��6��26��28��29��33; Anti-community 3: 7��8��9��10��11��12��13��14��15��16��18��19��20��21��22��23��24��27��32)with Q(C)=5.351.